Domain Intelligence
Last Updated:
Berkshirehathaway.com
Safe to Send
Berkshirehathaway.com is operated by Berkshire Hathaway Inc.. The domain runs 1 mail exchange and SMTP is responsive, with 2 of 3 authentication standards in place.
Safe to Send
RISK
22
/100
Low
Verify Mailbox
Verify @berkshirehathaway.com emails
Live SMTP handshake against berkshirehathaway.com mail servers. No email is sent. 10 free per day, no signup.
Trusted by 400,000+ senders
4.9/5
From 8,500+ verified reviews
Compliance approved this in two weeks thanks to SOC 2 Type II and the GDPR documentation. Verification accuracy holds at the advertised 99%+ across our 80k physician contact list. Dana Mehta · IT Director, Healthcare
SOC 2 Type II
GDPR
CCPA
99.7% Accuracy
Disposable
No
Persistent addresses, not throwaway
SMTP Live
Yes
Mail server responds to SMTP handshake
MX Records
1
Mail exchangers
Mail Exchange (MX) Records for berkshirehathaway.com Mail Exchange records. They tell other mail servers which hosts are responsible for receiving email at this domain, in priority order. Lower priority numbers are tried first.
#5
berkshirehathaway-com.mail.protection.outlook.com 52.101.10.16
Reachable
SMTP Handshake
Simple Mail Transfer Protocol. We open a live SMTP connection to the primary MX and read the greeting banner. A response confirms the mail server is alive and accepting connections.
Responsive
BANNER220 CY4PEPF0000EDD5.mail.protection.outlook.com Microsoft ESMTP MAIL Service ready at Tue, 12 May 2026 02:10:28 +0000 [08DEADCEEE38C388]
Primary mail server accepted SMTP connection and returned a banner during the live audit.
berkshirehathaway.com Email Authentication SPF · DKIM · DMARC
SPF
Sender Policy Framework. A DNS record listing which servers are allowed to send mail for this domain. Receivers reject or flag mail from unauthorized servers.
Pass
TXTv=spf1 include:spf.protection.outlook.com -all
Authorized senders are defined and pass SPF policy.
DKIM
DomainKeys Identified Mail. The sending server cryptographically signs outbound mail with a private key, and receivers verify the signature using a public key in DNS.
Missing
No DKIM signature detected on common selectors for berkshirehathaway.com.
No DKIM signature was detected. Receivers cannot verify the integrity of outbound mail.
DMARC
Domain-based Message Authentication, Reporting & Conformance. Tells receivers what to do when SPF or DKIM checks fail: none, quarantine, or reject.
Reject
TXTv=DMARC1;p=reject
Strict policy. Receivers are instructed to reject any mail that fails SPF or DKIM. The strongest available setting.
berkshirehathaway.com Domain Registration WHOIS · Nameservers · Registrar
RegistrarNetwork Solutions, LLC
IANA ID2
RegisteredSeptember 6, 1996
Last UpdatedJuly 7, 2021
ExpiresSeptember 5, 2026
Age29 years
TLD.com
Authoritative Nameservers (2)
- NS10.WORLDNIC.COM
- NS9.WORLDNIC.COM
About this Domain
About berkshirehathaway.com
Berkshire Hathaway Inc. (berkshirehathaway.com) is a multinational conglomerate holding company headquartered in Omaha, Nebraska. Led by Warren Buffett, Berkshire Hathaway is one of the largest companies in the world by market capitalization, owning subsidiaries including GEICO, BNSF Railway, Dairy Queen, Duracell, and significant stakes in Apple, Coca-Cola, and Bank of America.
Berkshire Hathaway implements enterprise email authentication on the berkshirehathaway.com domain with SPF, DKIM, and DMARC enforcement. As one of the world's most valuable conglomerates managing hundreds of billions in assets, Berkshire maintains strict email security to protect investment communications and subsidiary operations.
SMTP verification of berkshirehathaway.com addresses returns definitive responses for valid and invalid mailboxes. The domain does not function as catch-all. Berkshire Hathaway's enterprise mail infrastructure implements rate limiting on inbound SMTP connections.
For partners communicating with Berkshire Hathaway employees, strong sender authentication is essential. Major investment conglomerates enforce strict email filtering. Full SPF, DKIM, and DMARC compliance ensures reliable inbox delivery to berkshirehathaway.com addresses.
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Common Questions About berkshirehathaway.com
Is berkshirehathaway.com a disposable or temporary email provider?
No. berkshirehathaway.com is not a disposable email provider. It is classified as Corporate Email operated by Berkshire Hathaway Inc. and addresses on berkshirehathaway.com are persistent rather than throwaway. Mail sent to a valid berkshirehathaway.com mailbox reaches a real recipient.
How do I verify if a berkshirehathaway.com email address is valid?
The fastest way to verify a berkshirehathaway.com email address is to use our free email checker. Enter any @berkshirehathaway.com mailbox at the top of this page and our system performs a real-time SMTP handshake against berkshirehathaway.com's mail servers, confirming whether the mailbox exists, is reachable, and is safe to send to. No email is ever delivered during the check.
Can I check if a berkshirehathaway.com email exists without sending a message?
Yes. Our real-time email verification API connects directly to berkshirehathaway.com's mail server, opens an SMTP session, and queries the mailbox using the RCPT TO command without ever transmitting an actual email. The server's response confirms whether the berkshirehathaway.com mailbox is valid, full, or non-existent. The recipient never receives anything and never sees the check.
What are the MX records for berkshirehathaway.com?
berkshirehathaway.com currently publishes 1 mail exchange (MX) record. The primary MX is berkshirehathaway-com.mail.protection.outlook.com, which is the first server contacted when other mail systems try to deliver email to a berkshirehathaway.com address. The full list with priorities and IP addresses is in the MX Records panel above. MX records tell sending servers where to route email for berkshirehathaway.com.
Does berkshirehathaway.com use SPF, DKIM, and DMARC email authentication?
berkshirehathaway.com has 2 of the 3 standard email authentication records in place: SPF, and DMARC (policy: reject). Adding the missing layer(s) would tighten anti-spoofing protection and improve deliverability for legitimate berkshirehathaway.com mail.
Why do emails to berkshirehathaway.com bounce or get blocked?
Bounces from berkshirehathaway.com usually fall into three buckets: the mailbox doesn't exist (5xx user unknown), the inbox is full, or your sending domain isn't authenticated to berkshirehathaway.com's satisfaction. The fastest fix is to run each address through a free email verifier before you send, and to make sure your own SPF, DKIM, and DMARC are configured correctly so berkshirehathaway.com's receivers trust you.
How can I verify a large list of berkshirehathaway.com email addresses?
Our bulk email verifier accepts CSV or TXT uploads with thousands or millions of berkshirehathaway.com addresses (or any mix of domains). Every address goes through 30+ checks including SMTP existence, berkshirehathaway.com catch-all detection, role-account detection, and disposable-domain matching. Results typically come back within minutes and previously-failed addresses on your blacklist are reprocessed for free. For continuous high-volume needs, see our unlimited email verification API.
Is it safe to accept signups from berkshirehathaway.com email addresses?
Yes, with normal hygiene. berkshirehathaway.com is a legitimate email service and signups from @berkshirehathaway.com behave like any other real user. Pipe each address through a real-time email verifier API at the moment of signup to catch typos and dead mailboxes, but there is no need to block berkshirehathaway.com by default.
What email format does berkshirehathaway.com use for usernames?
Most berkshirehathaway.com mailboxes follow common patterns like first.last@berkshirehathaway.com, firstinitiallast@berkshirehathaway.com, or first@berkshirehathaway.com, but the actual local-part rules depend on Berkshire Hathaway Inc.. The only reliable way to confirm whether a specific @berkshirehathaway.com address exists is to run it through a free email verification tool. Guessing patterns will produce a high bounce rate and damage your sender reputation.
How is the berkshirehathaway.com risk score calculated?
The 0-to-100 risk score for berkshirehathaway.com combines disposable-domain classification, mail-server reachability, MX record presence and depth, SPF / DKIM / DMARC enforcement, DMARC policy strength, SMTP banner response, and domain age. Lower scores mean safer to send to. Disposable domains are pinned at the high end of the scale. The berkshirehathaway.com score is recomputed on every audit so it always reflects the live state of the domain.
Is berkshirehathaway.com a valid corporate email domain?
Yes, berkshirehathaway.com is the official corporate email domain for Berkshire Hathaway Inc.. It is used for internal business communications and is not available for public registration.
Is berkshirehathaway.com a disposable or temporary email provider?
No, berkshirehathaway.com is a corporate email domain belonging to Berkshire Hathaway Inc., used exclusively by employees and authorized personnel.
What mail server does berkshirehathaway.com use?
berkshirehathaway.com uses enterprise-grade mail infrastructure. Check the MX records section above for specific mail server details.
Can I send marketing emails to berkshirehathaway.com addresses?
B2B marketing to berkshirehathaway.com requires proper consent. Corporate domains may use catch-all configurations, so verify individual addresses before sending.
How do I verify an email address at berkshirehathaway.com?
Corporate domains like berkshirehathaway.com may use catch-all configurations. Use BulkEmailChecker's advanced verification to detect catch-all behavior.